The Harmonized Index of Consumer Prices category "Solid Fuels (04.5.4)" is a classification of nondurable goods and energy that includes coal, coke, briquettes, firewood, charcoal, peat, and the like. This category is a subcategory of the Housing, Water, Electricity, Gas, and Other Fuels (04) and of Electricity, Gas, and Other Fuels (04.5) categories.